Lifting jack



Aug. 30, 1932.

M. B; LUCKER 1,874,772

LIFTING JACK Filed July 29, 1929 Patented Aug. 30, 1932 UNITED STATES PATENT oFFicaY MILLARD B. LUCKER, or BENTON HARBOR, MIGHIGANQASSIGNOR, BY- Muslin ASSIGN;

MENTS, TO THE DAYTON MALLEABLE neon. COMPANY, or nAY'roN, onro, A coin PORATION OF OHIO Application med July 29,

My invention relates in general tb'pushing her from rotating'within the jack housing during the projection of the member.

Another important object of my present invention is to provide, in a doublelift jack, simple and positive means for yieldably preventing an extensible jack member from rotating in its housing while being projected therefrom, which means will permit of rotation of the extensible member at the limits of its travel.

A further object of my present invention is to provide a friction device carried by an extensible jack member and having interlocked engagement with a grooved portion of the jack frame whereby the rotative urge imparted to the extensible memberby the operating means may be counteracted during the extension of the member from its frame.

Still another object of my invention is to provide ina pushing apparatus, a friction panying drawing discloses a bodiment thereof.

. embodying my present invention;

clutch of simple rugged and inexpensive construction and positive action for preventing the relative rotation of theextensible pushing memberwithin its supporting frame.

Numerous other objects and advantages of the invention will be apparent as it is more fully understood from the following description and taken in connection with the accompreferred em- Referring to the drawing: Figure 1 is a vertical cross section taken longitudinally through an automobile jack Figure 2 is aperspective view of the several parts of the friction clutch or extensible member of the jack;' 7 Figure'3' s a sectional view of the jack illustrated' in Figure 1, showing the applicationof amodified friction clutch to the ex tensible member; and r Figure' i is a perspective view of the several parts of said modified friction clutch;

To illustrate my present invention {I have shown on the drawing an automobile jack including a support frame comprising ant-extended base lland 'a cylindrical sleeve 1 3'extending upwardly of the base and providing a brake for the housing. A bearing support 15 is arranged at the upper end of the cylindrical sleeve and comprises a band extending across the open top of the cylindrical sleeve and vertically spaced thereover. A. bearing 17 is formed in the bearing support 15 in vertical alignment above the upper end of the sleeve 13,

Strengthening webs 19 are arranged in, the

with the bearing support15.

junction 'of'the sleeve 13 with the base 11 and The sleeve 13 provides a cylindrical channel 37, which extends through the base 11 to] the upper end of the sleeve, which is formedto provide a bearing seat 39. The lower end ofthe bearing 17 and the bearing seat 39 are spaced sufficiently to permit a beveled gear 21 to be slid edgewise'therebetween, in order that it may be pushed in the bearing 17 the hub 23 thereof sliding upwardly into the bearing 17 after the gear has been inserted edgewise as aforesaid. The beveled gear is supported in position by means of a roller bearing 41, which may be" inserted edgewise between the seat 39 and the lower end of the gear 21, after the latter has been pushed in thebearing 17. Theroller bearing 41 is pro-' vided with a central aperture ofequal diameter to the channel 37. The beveled gear 21 is thus rotatably mounted in'the bearing 17 and has a toothed periphery 25 extending outwardly to engage a cooperating driving pinion 27 carried atthee'nd of a stub shaft 29, which is suitably journaled-in a bearing 31 formed in one side of the bearing support 15. The shaft 29 is provided with a non-cir- 'cular central socket 35, which is adapted to accommodate the-non-circular end of a suitable jack operating handle (not shown) by means of which the pinion and gear 21 may be rotated in their respective bearings from a distance.

The extensible or lifting members comprise an inner shaft having threads 47 extending throughout its length, and an outer sleeve 49 provided with external screw threads 51 ex tending from the upper end of the sleeve to a a point spaced from'the lower end thereof. Phe threads 51 are adapted toco-operate with internal screw threads 57 formed in'the bore of the beveled gear 21, which thus protubular extensible member 49. will be pro-';

vides a rotatable threaded collar mountedin the frame, rotation of which Willcause the threaded sleeve 49 to move axially in the frame, providing; the sleeve is held against,

relative rotation, therein. The sleeve-49 also has an internally threadedportion 53 at its upper end, the threads of which areadapted to co-operatively engage the-threads-47 .of the inner extensible member 45'1so' that, upon rotation of the'outer extensible member, the; inner member willbe projected-therefrom provided it is held against rotation. A stop or peg 59 is set in the groove of the threads v 47 "at the lower end of the inner ex tensible member in order to limit the pro-- jection of the inner member by engagingv the lowerend of the threaded portion53 when the inner member is in fully extended posi-. tion withrespect to the sleeve. A similar stop 83 is set in the threads 51 of the sleeve 49 and performs a similar function by engagingthe lower end'of the gear 21.. In addition,

the peg 83 provides for driving engagement between the gear 21 of'thesleevewhereby the" sleeve may gear '21; 1 c

I In assemblingthe device, theinner member istelescoped into the sleeve through the lower end, and the threads 47 thereof are meshedbe locked for rotation with the with the threads 53 0f thejsleeve. 'Afterthe shaft '45 is thus assembled, the sleeve and shaft are together inserted into theslee've 13. through the lowerend thereof by sliding the parts longitudinally through thechannel 37 and through-the opening-.43 of the lower' bearing. The external threads 51 of the sleeve; are: mated with the inner threads 57 of the-rotatable collar or gear 2-1. A peg; 61'

is then set in the groove of. the: threads 5.1 of the sleeve above the collar 21, which pegby engagingthe upper surface of the gear, limits the downward movement of the extensible sleeve. This peg alsoprovides for driving engagement between the gear and sleeve when the latter is. at the lower limit: of its travel; A load carrying head 63 is finally mounted to the upper end of the inner ex tensible member T45;

Upon rotation of the gear 21, the extensi-: ble-members 45 and 49 being-in thecollapsed;

position, illustrated in Figure 1., the outer or jecteol axially by the cooperation of the threaded portion 57 of the gear and the threads of the sleeve, providing of course that the sleeve is prevented from rotating within the frame.

Iprovide novel and improved means comprising-a friction clutch for preventing such rotation during the extension of the sleeve, said means being yieldable to permit rotation of the sleeve with the gear 21 when at the upper andlower limits of its travel. The

The collars are tween the collars. 65for normally urging the same'f apart upon the lower end'69 of the 1 sleeve, the lowermost edge of the portion 69 being peened over, as at 71,,to retain the lowermost collar upon the portion 69.

I prefer to form the resilient means as a plurality of springs-81,. comprising washers K of spring steel having central openings of suiiicient size to permit the washers to embrace the restricted portion 69 of the sleeve.

Thewashcrs are bent or off-set, as at 85, and, are secured together, in opposed relationship in any convenient manner, such as by spot welding, riveting or the like, to form a unitary resilient member, which may be compressed between the collars 65 when the same are-assembled to the lower end of the sleeve. As amodification- I merely form the resilient spring 81 as a single distorted washer of spring steel as shown 1n Figures 3 and. 4 of thedrawmg.

a frictional engagement between the collars and the sleeve at the shoulder 7 9- .and' the peenedfover portion 71 sufficient to normally prevent rotation of the sleeve with respect to the collars 65, since the ears75 of the wash ers set in the longitudinal groove 77 throughout the movement of the sleeve, relative rota:

tion ofithe sleeve with respect to the lions-l ing '13'is normally prevented. 'The friction connection'between the sleeve and the collars 65', however, is not suiiicientto, prevent the rotation ofthesl eeve when it reaches the limits ofitstravel, and the-pegs 61 and 83 engage thegear 21 to form a positive drive connection therebetween.

0 partition,

the gear 21'is rotated in: its bearing} the sleeve 49,: being held against rotation through the friction device,.willbe raised axv The action 'of the springs Y 81 is tov force the; collars 65 apart and to cause ially by the co-operation of the threads 57 and 51, and will carry with it the inner extensible member 45. When the sleeve is projected sufficiently, the peg 83 will engage the the rotation of the gear 21, the sleeve will be withdrawn into the housing 13 until the peg 61 at the upper end thereof engages the gear 21 and forms a driving connection whereby the sleeve may again be rotated by the gear, such rotation resulting in theretraction of the inner member 45. 'The inner member will be retracted until the load carrying head 63 engages the upper end of the sleeve 49 in which position the jack is in fully retracted condition.

The friction device whereby the sleeve is prevented from rotating in the housing 13. during its projection and retraction, but permitted to rotate at the limits of its travel, provides a maximum frictionin a construction embodying extreme simplicity and durability. Construction also lends itself readily to production on an economical basis, it being apparent that the collars 65 and springs 81 may be stamped from sheet metal stock.

N o accurate machining of the parts is necessary, no auxiliary housings are necessary and the construction is such that it may readily be embodied in a commercial article.

It is thought that the invention and numerous of its attendant advantages will be apparent from the foregoing description, and it will be apparent that various changes may be made in the form, construction and arrangement of the parts without departing from the spirit and scope of the invention or sacrificing any of its material advantages, the form herein described being my preferred embodiment.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is 1. In an extension device, a grooved frame, an extensible lifting member arranged in said frame, an operating member rotatably mounted in said frame and having threaded connection with said extensible member whereby the extensible member may be moved axially with respect to said frame upon rotation of the operating member, and a friction device carried by said extensible member and engaging said frame whereby to prevent relative rotation of the extensible member with respect to the frame, said friction device comprising a collar mounted on the inner end of said extensible member and spring means urge ing said collar to frictionally engage the extensible member. to prevent'relative movement between the collar. and extensible member, said collar havinga projecting ear, adapted f to engagethe grooved portionof said frame. 2. In an extension device, a frame, an extensible lifting member arranged in said frame, an operating member rotatably mount ed in the frame and having threaded connection with said extensible member wherebyto move the same axially, a collar carriedon the lower end of said extensible memberv and're: silientmeans for urgingsaid collar t'o frice tionally engage the extensible member wherebyto normally prevent relative rotation therebetjween andi'co-op'erating means formed and arranged in the collar and the frame for preventing said collar from rotating with respect to theframeq H i 1V 3. In an extension device, a' frame,=an-extensible lifting member arranged in the frame in position to be. retracted. and, projected axially therefrom, an operating member rotatably mounted in the frame and having operative, connection with f said extensible. member for imparting axial movements thereto, said extensible member havinga shoulderqand an unthreaded projection at itslower end, a colla'rmounted on said projectionand engaging said shoulder, a second collar mountedon said projection, said projectionbeing peened over at its lower'edge to retain the, collars thereon, and spring means normally-urging said collars apart on said projection whereby to frictionally engage the extensible. mem-;

ber, said collars being providedwith outstanding ears and said frame being provided with alongitudinal groove in which said ears are engaged.

4:- In an extension device, a frame, an extensible member arranged insaid frame for projection and retraction therefrom, an operating member arranged in said frame and having cooperative engagement with said extensible member to move the same in the frame and means comprising a collar and a spring normally urging said collar to frictionally engage the extensible member, said collar having keyed connection with the frame whereby to normally prevent relative rotation of the 4 collar with respect to the frame While permitting the same to move longitudinally. v

5. Inan extension device, a frame, an extensible member arranged in said frame for projection and retraction therefrom, an operating member arranged in said frame and having cooperative engagement with said extensible member to move the same in the frame and means comprising a collar and a spring normally urging said collar to frictionally engage the extensible member, and means for keying said collar to a formed portion of said frame whereby to prevent relative r0- tation of the collar with respect to the frame 4 p p A 1,814,772

While permitting longitudinal movement' of the collar. 6. In an automobile jack, a frame provid- 7 ing a housing having an upright channel, an extensible member arranged in said channel for projection and retraction therefrom, a sliding member carried in said frame at the upper'end of said channel and having co-operative engagement With said extensible member to move the same in the channel and means comprising a collar having frictional engagement Wltll tllG extensible member, a spring urging said collar fricti'onally against said extensible member, and means for keying said '15 collar for splinedengagement with the frame whereby to normally prevent relative rotation of the extensible member with respect to the frame; r t

7. In an automobile jack, a frame providing a housing having an uprightchannel an extensible member arranged in said channel for projection and retraction therefrom, a sliding member'carried in said frame at the upper end of said channel and having co-operative engagement WltllSLld extensible memher to move the same in the channel andmeans comprising a collar having frictional engagement With the extensible member, a spring urging said collar frictionally against said extensible member, and means forkeying'said collar for splined engagement With the frame whereby to normally prevent relative rotation of theextensible member With respect to the frame, and a second extensible member 7 having co-operating engagement with the first mentionedextensible member. p

- In Witness whereof I have hereunto sub scribed my name. 7 240 s MILLARD B LUCKER. 

